Dimitri Marick is a fictional character from the American ABC soap opera All My Children. The role has been most notably portrayed by Michael Nader, previously famed for his role on Dynasty. Former head writers Agnes Nixon and Lorraine Broderick created the character in 1991, designing him as a brooding and mysterious character based on heroes from gothic literature, such as Maxim de Winter from Daphne du Maurier's novel Rebecca and Heathcliff from Emily Brontë's novel Wuthering Heights. The character's introduction raised All My Children in the Nielsen ratings, placing it consistently as the second most-watched daytime soap opera in the US.

Soon after his debut on the soap opera, Dimitri became a complex leading man and took part in some of the most notable plots of the 1990s. He had a very popular romance with Erica Kane (Susan Lucci). Dimitri and Erica's storylines include a tumultuous romance leading to two failed marriages and a miscarriage. One of the biggest obstacles in their relationship was Erica's vindinctive and manipulative daughter, Kendall Hart (Sarah Michelle Gellar). Dimitri also had a popular romance with Alexandra Devane (Finola Hughes) and a loving yet antagonistic relationship with his half-brother, Edmund Grey (John Callahan).

In July 1999, Nader was let go from All My Children due to budgetary considerations, however, he later returned in May 2000. The following year, the actor's arrest brought him and the character to the center of a large fan campaign organized by a group called the Loyalists, as well as a highly publicized lawsuit catching the attention of People and Entertainment Tonight, among other media outlets. As a result, Nader was let go again by the soap opera, with an official statement saying they would be prepared to consider having him return once he had addressed the lawsuit issues. The role was temporarily recast with actor Anthony Addabbo, who was negatively received by viewers, and let go shortly after his debut. Nader later stated in an interview that ABC had informed him that they had no intention of ever bringing him or the character back due to a lack of storyline. In 2004, Nader's suit was subsequently thrown out. In May 2013, after a twelve-year absence from All My Children, Nader was announced to be reprising the role, with his return airing on June 12, 2013.

Casting the role of Dimitri gave All My Children difficulty. The series' casting director, Judy Blye Wilson, tested between fifteen and twenty actors, and could not find the right actor for the job. Wilson then learned that the former Dynasty star, Michael Nader was available and suggested the show offer him the part.

Before All My Children offered him the role of Dimitri Marick, Nader already planned on working in both Los Angeles and New York. "My fiancee, Beth Windsor, had literally just worked into being bicoastal," he said. "She had an apartment here and I had been seeking out some theater here in New York and would have been spending time both here and in L.A. So after we made the decision to go ahead with that game plan, this offer (Dimitri) came on the table and when we worked out all the figures moneywise it was a great opportunity." Despite Nader's prime time success as Dynasty's Dex Dexter, he did not look down on daytime television. "The fact of the matter is we're in a different era," he said. "And if you look at the cutbacks in Hollywood, being on a soap is not of any less or more value than being in any other medium at this time." Another factor that contributed to his decision to join All My Children was the actors strike. He intended to stay on All My Children for a year. That year turned into more because the actor fell in love with New York.

Since finding the right actor to play Dimitri took such a long time, the show had already begun taping around the character for two weeks. Nader spent his first weeks on All My Children working overtime to catch up. "By the time we had resolved some of the terms," he said, "they were really against the wall in terms of back story.... In retrospect, I should have just slept on the set because it was like sixty or seventy pages a day!" Nader also taped his scenes out of sequence while dealing with sixteen different scripts from different points in the story. To keep each scene straight he gave them each a name that described the scene's main action. After those scenes were taped, they were spliced into the otherwise completed episodes. This went on for two weeks until the episodes were all caught up. Another complication Nader dealt with was the wardrobe. He said, "They had devised this sort of 'tapestry' layered look for Dimitri and it was like doing scenes inside a sauna." This was eventually rectified, but not before the actor lost around twelve pounds in the two weeks.

Michael Nader was fired from All My Children in July 1999, due to budget considerations, and Dimitri was killed off. This led to a fan outcry from viewers who campaigned for the actor's return. To partially appease them, the show's executive producer, Jean Dadario Burke, offered Nader his job back on a recurring basis. He rejected this offer because "after being a major character for so long, it didn't make any sense to me. So I declined. But if the network was interested in seriously discussing Dimitri's return on a contract basis I would love to go back."

In May 2000, he was rehired and brought back into the role with a multi-year contract. The return story scripted for the Dimitri character centered on the romance between his brother Edmund and his wife Alex. Dimitri was revealed to be alive just as his wife, Alex, and brother, Edmund, had sex for the first time. Nader said he wanted to create a deeper layer in the character instead of focusing solely on the love triangle between Dimitri, Alex, and Edmund. "I do hope to pursue some sort of subtle spiritual change, some perception that Dimitri is different," he said. He questioned the writers' storyline choice in not exploring the popular Dimitri and Erica romance again. "I found it sort of odd that they'd move me so far away from Susan[Lucci, Erica]," Nader said. "They're trying to explore these other themes."